如何从不同的功能中获取变量

So what I'm trying to do is get a search term from one function getRandomVideo() and use it in a jQuery statement, so for example, get beethoven from the variable searches and use it as the search term to get back JSON information and append it to a div. I know next to nothing about jQuery so any help would be great thanks :)So what I'm trying to do is get a search term f